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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'af866de52c46a5a3c7f3ce0dd908b1992449f961f5286c7edff55186eeced48e' 
  AND token = 'Yq7HN1BVS3B5WSl1GQ/3oA8R5JgjGw6x8vVQJkQ0A4w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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