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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0e55a9388fdfdd433750d51b1a9a5f44e32d69c1be0f5b810244133ec16c245c' 
  AND token = 'qydP/PR7cLCNj94EYsGBej54+ovGrWkcGf3cqMSH5f4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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