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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5e827c4c2c1bd2dd0a8696b3d8a9735d4ed5ddbcb4f742a546920cdaca8d0708' 
  AND token = 'tb0rFt3nrrNVUMcHQgw1bq4xbWIGKkHzKByAA4MIewk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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