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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'db1ac7e3f8968e6794f14fdbc2d90f8c0340d180478f0e88269edb05ccfe4f9b' 
  AND token = '+yCeY75VWZdzyX3fIudU7OTUQjDxNwsO95WZvigmzTA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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