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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6817dfd5f60ba5cac2e1c47f5e15871318fa328f404fd0d62a5c66994c5103eb' 
  AND token = 'w3c8IV29Y1HAg1xmr2hkyY7I+6SqIgmzNQeTGbVOFKQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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