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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '68ad2232f02105c92a0c3df96df9b3f1239821c8c94d927e6a88673870673cfe' 
  AND token = 'bK01GmAy3PAMX015wUKWXhJriYh6u5FnWowUFPUU5Rw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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