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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6e3865adae9e37db6a9007bd0a2e6bb754341b50b683b28624bfc810287d602b' 
  AND token = 'UYrACrlTVwXuFnV0/FULxzSb6FzjYO5sIP1Ctv9g1/I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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