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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '456b1a800d6388f3f44d9e667db7581afd76e02b99cbda6b1fcd9a51fc39efde' 
  AND token = 'pQTM9BODy1QNMaUOvwB2ZznWzzQy7Yn+SECvQIIpuEE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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