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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6f2fdc7dbfeb1e0dc116dc387f9d2a027685f2d4818aa94c276b6a9bc41ea370' 
  AND token = 'HlGBomL5XAcf44XgajIOde3o6eSwKdJxfGJTC8jNi8I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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