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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '82fd0561ebc8942f2df1479908d8740bc7c71d8b1c141ed5aa54b54c7b87183f' 
  AND token = 'RrrV2kfrjJVg8uajD89MVceVPFIu8d5fT8raeEvMUsA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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