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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '608b8add9d2510671ce28b076b0f7301a8598967a8e236df877bd016352150aa' 
  AND token = 'LLR859wZzsm5uQM5TQGkKDHM6wDJX4ICPpOKmfXs6DM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00007

JSON explain

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