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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd2d12fac6f3346453f21f820df7058409f312ecde6630d3b0abb9b16497dacda' 
  AND token = 'OxqQlOcFvPC2YIPePpuOVj6RcjrIodRfv4d74Gm8+zw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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