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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'feeaf47137c7325422083ad7e10ace4973e54a1252e4c5627a6796b19465bf50' 
  AND token = 'ABrw7tvMg6wDmiRhMnFrk8hazUnDlcsMU8CUNo9V7bU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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