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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0f8df754d32bc5e13ed3c6c062eecd64f1850f7a85e84b3e237cf99375b6b984' 
  AND token = 'q1oZDpHFugM9mqUuaIaAruTP6U9I17TGljzzjag3W9c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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