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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0b26caaf1ba85e371f6c61ab9acccdba079e59df8868b60a85b8bc87342c18c6' 
  AND token = '9PNSlPuGIy/830Oqq327YBla8zlj47B03NxxjL9WBXE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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