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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1610f9060bcbe400702594dc3ae1506536479c90fa6a68fcddad87746dfc9b9a' 
  AND token = 'IXO51EXSmfSj7CUwYKIclXtR8CrZp2+Gw68v7ffp3h8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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