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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'edfeb8c70e79bac2373fa79062386084d74842a651864c45db192cb34b8ecab3' 
  AND token = '3S67MOd65V2NQOUhWmn1/Pw0BIJRgbn9qzp/LlUbNbE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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