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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dae7e7329a34296f731484534f41741e4d3c5a1f21ed5cc2d97c4279b21ad284' 
  AND token = 'DI4JBZoEr1iY7BFT+b068np+Jqedpikfscuny9Ta0sc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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