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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f830edec8bee1bcb08ac2cfd05f4492f9a49583859037875ab8dbc10a13fdac4' 
  AND token = 'KmvCW6Aki2c5MVAepiticAJBlWpyCO+0SRLR6rY1lsQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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