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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '37f6ba5d485fb5193d6efc273c07b3a63099c46ee68c6d801e0d426cd0109ec3' 
  AND token = 'isWdlT8JhztEAQSayTR6ZIlbtbsQVNyjHBeOEf6Z8cc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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