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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b9ed491be4d15db6d1cec13f90f20a9143088278c28c3dcc64349b78698e3f92' 
  AND token = '1IS7ivqB0eFgTZLcHVnkIQeQW6S4CCOfZllzfZOwJcA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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