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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5f014ee292beda48278bbab3cc7f054ac994213489ee9de2f6b48d71c0d87cda' 
  AND token = '3+VEK9zrWjsc9ExP3Q4LSgdrWHkm2eYP3fAPXpS2ILc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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