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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7690c5ce0fa4636f3d5631061832704d78e504777898648892b5ac1b3e7a44f8' 
  AND token = '1qGLe6Qag4TzdgQuaGQXPpGBDeoQ/joSzeghY9YWlg4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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