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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8441845ea7f6a0bf91ac1a0faa9a886c3936df1de62a0e799cc9e3c221549d5e' 
  AND token = '8rUfrdmGkWOxeUz2vpzNChbD/1fXFxnvfxrVVLMJ+lY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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