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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '62d1be11e7d4085e6281076c3e84d89bc686b7d3e7ffa324fdfa53e61843dacf' 
  AND token = '/IS/eWbEtdLg/tHvTXvQSApWPUAqtYbnW5puyzu4CYQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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