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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7566cebc4bca8df7de639f4a7f30baaf39b19f307660cbb203d619453db96b39' 
  AND token = 'A5C+M2aPoaPIU+r0sjbLtZSpR+gw0BwztxKi+BAg4Uo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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