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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a91a929f9d61eb3f094da396b7d47f6e03e1c209e9666d4f9f405527838d4d0d' 
  AND token = 'WnuxjPLWR+3fA25Luf8qccMU/+2xUk38wlc2p6jasok=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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