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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd20e2615c11cbf18d9ee6603f6e486289c446d7217f35e6d4e6c9566d8a9af87' 
  AND token = 'a68UNQb93K6rHBnJSk80FgAeB2/IVHCOIkGtQ+b+T5w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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