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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '58599b62c8e165a17893aac2c622e020a88c4a31d6a3a41202ca81daeaaab3ef' 
  AND token = 'Obtp7ZhOVmzTg1LNXeCFL1zCIP6waYxiHJs+w0rAZuc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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