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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '38db8dfdc4e07f6702d8df1e015e272aa7f9cb26218fd9ec75ded265a74e4fb5' 
  AND token = 't8Spg2PlXx8Iglg0q5q3fiHbD3TNyBG9KgneO2faL2o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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