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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd0752180120b566a2067f083a32068a65f9eb8a58a438380ea7bb30b2f4bd004' 
  AND token = 'Puag6zOjye+MHn9f0np5BOE55uY6ljlmXhFijJLnZ8U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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