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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '85cac3c88c27720605e3bcfc6aa8086539cb84b7eecb922450ef030d2dedfb9f' 
  AND token = 'UVRr2ChDmO0UU6K+iDxZZQIuwRgWIKyJne7Qi8OW1r0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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