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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a82be30e8e1fffc052f32ba6bc07b5242294e07b87fec6b14dd13791ce99813e' 
  AND token = 'sJbrDoWMfDymOtAQpKgwTZFxQq73NDNFNko7lDrvjX0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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