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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '56e09377ffec8ed2c5ad8ceb86b7e1501875f3f83fa9b2c8d58ba9e9e32ed269' 
  AND token = 'xINZbg7RfSLw+4J/2rgWODAzFDvOUy02/s40H9Xcp7g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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