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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '099a2e71282551bde28b98fc82c5d90a2b276a6fd7b36118b00d1cf1b7caa216' 
  AND token = 'RDeKOip6KkQhUYePOx/Al5kP0l07KZ87BpIcQgaz6Lg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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