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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4ebacc661bdbc531d77192f33c8ecdc929d405c61c9c2e720d0e0b051dcca5ee' 
  AND token = 'H2Z0RAllLu04zBXMunM5aZz/fejsK3pVrgrwsSrZxCc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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