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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c9087b298b03d66beddaa81dfb1b2e7c3fa374b23a7490aa9505bf232368a8a8' 
  AND token = 'k6ynJ8GpZoc7i8C8Pc1UKsUgu/NN1/TQSDiTLw/DUXQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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