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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6e71918bb4c6d5ab90ff1682a0a3dcfe9a42d8cf35c1005e081b1baefa2d56dc' 
  AND token = 'oKmgz7BTHOdtk9i9ANrUw7iNR/4YOso+DrrYEi8oNM4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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