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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da7852e055a49526642fa537a151b7dcba93228623383535ae5452a5837cb80e' 
  AND token = 'Hk44kZFfZapAttSD8wLcyaqe8wFoK/ZrRVKCiaaY2TQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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