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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ebcaaf5a43ece00fc2e3c157f981fdbf071308f19228b8217aa71bfdb53b53a0' 
  AND token = 'pcet2Whg+PMnx9bHtyKLsHXa4osH7m424W5h2/488JY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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