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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '601aaabdbafb0ab5ff2a6a9084ed004c4210ec75867a7e786a79a0ab6da234e6' 
  AND token = 'oHw7DHQognkQ/fwHHBM2uGr3rf1qmTbDkaTBo8iNJeM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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