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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8f25c1c29edc59587893bc07c623c71292b57f8ea84938575e8c9c0367f61921' 
  AND token = 'lwpLkxM/bu4MLWU3KuNlkxI2CilTe7ulYGjkWDnjRWA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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