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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd606a34e8895e0945367541a1ac32c85895435d6a2ef8aad3be6d19b5c10bb34' 
  AND token = '8xSGnq3EvSX6bGbjALM4CM+ps5Q5pX5OBVYky8IaSok=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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