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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8bed02d403534551d4ba4a12a644f8707048e0489837b08f617ab0d1b1c0b5bb' 
  AND token = 'WTqsf6AnDDgUtuVPTs8Kt2SdOOwgIuyn4Di+KE55n68=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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