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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '62c00fe97ccdee60a6797c4f291d0f4a8e2aaac1aa325c7171b203e2bd735449' 
  AND token = 'zvMDAisRLkdDB++nbBm9ElfxRt2wCjmSDE3vAj4P/jU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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