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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '43a9347a18970f22a7062db7cd8fb763275cfb3db5ab33d2ccc37343598a035e' 
  AND token = 'i5+LIeRt18hEpkwOQsStE4vSwGdpDoOINGZ7kEzG3S0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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