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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3107f391e271709b7a132593b1f0aaea9cf2c2ed43cd0c9942bc5ef4bd55958e' 
  AND token = 'QYXQVacur9vwqUh+tVe1x2bLrCUkinqBbBNbP/6KvhI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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