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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8c9142b7cf14cfdc2440227db88987b783398f9f5c70dee0fde7c9902eaec14f' 
  AND token = 'l3HR4I6qldailOdYurn/cO1qgJuk82t/sZt60J9AVug=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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