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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '116b824f6519812f501b67e0a5e85c20cd226c3bb96b2c7a1ea58c7f5d361eb2' 
  AND token = 'HREHZRfYizJai548MrrnbX8z/S5Hk2vofz8wuafSP2M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00060

JSON explain

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