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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '845165a9c3d601e74251a703e686df43eede25bef23d85ce5e691f6f27e10c0f' 
  AND token = 'rUjEz9YPxQLQj5WQ/CwCOnCDRhmqQ4pb/xu2cuP2Co8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00058

JSON explain

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