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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b98ad31f29e6edfe28c347b83773e73c5ba58d3458e62f706f5eb754a717d097' 
  AND token = 'Fgo9Ha560VlPSWnMw/XzuL6+Fa3pj/0j0s3FliGohcc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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