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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd145894305f0584613227fbb67eee22d78d2227bd4340cec54d7e84a1298d931' 
  AND token = '2sXLR5oXK7F88hD2F1t1C4kMTuTQnnhqqQj42vwFnKI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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