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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '31d449f7a5d99ec099781ac77d5b9dc90657b23ff304dca8f3ee1da0bac653dd' 
  AND token = 'oJJBEFPsncALzmiRKes+M5wmsf1Yr0Ez7aZWZnGk6SI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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