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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a2d5a847e785d6f70b57a5fea61a9ab53297a4b792e631fc923b6ff66a1d19f4' 
  AND token = 'e16q1Hg9QTYSiJt/USN07W+fdOIn/ji1R9bdG35oRVg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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