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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2985736c2e959c468cd8f171299ceb3855f36ec6735b6f4ee3e57211969d1592' 
  AND token = '8nVUCWvZRjcN+lhoy1BA5d49v4Xj+WnnjAvaDP/fjEQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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