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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '02fe6ea1fa476e45dfd8aa7ed340ab740b3f9c6c2d68fce68066f426f180bf9e' 
  AND token = 'OVy9+tAgFbRhoKFG+nHRTK0UqgvWOxetrA+BuM4l+3M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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