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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '637fab381ae467c689645a7b0dda84563f1e6db4ad71e372eac4d478afd6f96b' 
  AND token = 'oWWhzfsOVC9gPJz3DJoadHZ52NaxcnBGp4y51iKu1ww=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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