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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1f9cd9e1d2a4dcdca77c994a68d4ffc67f2b2a1749302d316f5e53eb2594be64' 
  AND token = 'v821AZv4evXfDJAh6jNqxzW8/BTRtcCZftqZkL4DWoQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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