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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3d45a872ab3bf9fd55b9d89bc7e66e3212b8451b3b8b78c7d6ef8d56dce9a19f' 
  AND token = 'Qo+qWKBHU4x+I6H80Ced3YKerbry8Gxz0Krk7EDTvT0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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