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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5d83ab310b4b7c0bbcfe30b1bb0822ca2d3a7bf19e197dbade0f125f2d4c8e71' 
  AND token = 'TmvqMfE7jBhWDSNDcbgE7ORjv45nKpcfNgU58PB+z7k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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