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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '37bbf8de207a9b5c741577ffd806cfc02416f3c14ef1501fd2b2e1977ec7439f' 
  AND token = 'VAM3H3n2MRf3GXoFHmo9XE6DqHBkQevA4GCRHXmiqH8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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