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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aabdc1a59bb5f33cf0c8a645dea39c34ccb283d3c9ff4d9d7d149a847adefb16' 
  AND token = '518GcfoCl1R56uU0Ng1MbHG+U4BF9iF+81Q2oix9jcs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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