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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '952663c54ce86f31c97ef4e6782dc48dfa93ad8180dd567f3678c1fe4538257e' 
  AND token = 'nFasJPnjN3EcMFVclFATQAyu9iLN6AHM5HQM7tZTAoM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}