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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7680454f6d8de621f693095774477703565665a7150baf2dc4c20894bda4f197' 
  AND token = 'zlF8qlJpHaWwRTeS7Ds+j15o7RzUeLTt9IkelWyiHpE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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