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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1a5b3bc4a734015e9d1c10cfd169f800934399ca19eb286fa65dc19485371653' 
  AND token = 'lMbV1tWKkNA3uw2SaMYYDPYXJb+o27lT/F8t6VTiZcs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00008

JSON explain

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