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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6e2513d0c22f45899fb14f315eba689429dc6e5f48d3bc89084ce1d86dfbaff3' 
  AND token = 'xmvlrHkrVwWBF9AHWg79bUEumgo4Mx+EXCTeSlbw6/Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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