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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c96bb2997cae0daa67134aef843d2cdb502771741e4aee6ea997a6439833025f' 
  AND token = '8379yKIp+8u/0h7D/ye+DHNnMpWlSfXtGekzQ6yss2M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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