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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '61a2b8487f79e54df4313e85feb9a6973c06568bc07486f4f2990e755d3d08e4' 
  AND token = 'FskrfvXCiM1SSoLPoZ09Bu8x/4TqWE6EKQX4NRsGWaY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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