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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '19e301b174909fda7765cf2381dba01f3eb9e76f4dd7cd4a30244ef2e4c2957a' 
  AND token = 'RVFCvUJbjyRToL97bkU6uWwmdiDwIpKFWDJGU1elm74=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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