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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e8ecb5777f3a49ea630561d03d156e4911808888ee4d5ef0d412839eeceb8052' 
  AND token = 'iPEUm6Z0XLdpHmehFirlPDscr06HX8ycO91T1rgI+Rs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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