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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c162de3fe7c5fa5b0405a7aa329471d5cffdf628b9344933cd5e53dc53c74174' 
  AND token = 'Oi9mlXWUu9EHVuypbEWSSMeg75d7fvgsGKwirRHS3N0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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