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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0e8e3df6fe49e965c9fac55c78bb781fcdd8364f5b46dfadbb5e7af4cc893a9f' 
  AND token = 'hEGtUyTNFPGM0mrB7u6tVZoDYzAGQI5Adi4t9QyOobY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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