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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '86ad5e6b6b8832285fce2769cb9185f8983b449af0d0f140f8d0cef5c609afc4' 
  AND token = 'y51ghn2y3AykByjHd4bKXm2u8OZp9BzpQsK6gNX76ho=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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