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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cbbb087ba37c23b669a2797a23f9de70d3349af12c976c96210abf6ff6d51840' 
  AND token = 'LjI7KfLc80n4Rto3kDyeHkNmqS6KRsXI1JWfXlrqt8s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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