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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd3024989c345372dba1cb478e6009e1d2826edb5b09ee800bdbe432fc7fd0a6' 
  AND token = 'qv3SJVo9gT2+kcLkSiBDeVRN14wf7ybBC2b6hHRy2TY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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