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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '991800b1f1085e4e6b4d8860aa83f848d063225b329ab8fd225bc2c82926dcaf' 
  AND token = 'UARk0gB5fIRAlryIWXYYZLuAxfAhrHfH2cZZ3Ru+AQs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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