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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7d7caa9ec0e7d9179c95c92b9d116f96fac1e9fd99bfbb1091a70d6dd6c8278f' 
  AND token = 'vGE6luPzvs2PcZbu2ivKKEunuaypFMJa8xr+avHV5p0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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